Please do not support this establishment.
You can not tell someone to leave their guide dog in the car and you should be ashamed of yourself. This dog gives this woman independence and you can't request that her husband guide her because of this.
Guide dogs go into food establishments everyday and by law you can not ask or tell them to leave. These are working dogs, they're not pets.
Please take a look at bill 70.
Service dogs are protected from discrimination. Not allowing this dog into your establishment did not only go against the law but also Canadian human rights.
I hope you learn from this experience and will not let this happen again.